问答题 The two leaders already met once over diner Monday night, shortly after Obama arrived in the frigid Chinese capital from Shanghai.National security adviser James L. Jones described that meeting as an "informal diner discussion" in which the two leaders discussed "the evolution and histories of China and the United States".

问答题 Obama also called climate change and nuclear proliferation "challenges that neither of oar nations can solve by acting alone".He said the two will continue to "build a positive, cooperative and comprehensive relationship".

问答题 More importantly, the research opens the way for the peoples of the East and the West to learn much from each other in fundamental ways. The Chinese could learn much from Western methods for determining scientific truth.And Americans could profit enormously from the Chinese tolerance for accepting contradictions in social and personal life.